A Blob Thrower is an odd creature in Metroid II: Return of Samus resembling a flower. It spits out Blobs that will harm Samus on contact. The Blob Thrower itself is sessile; its main stalk is embedded into the ground by vine-like roots, though it can extend and contract it in order to launch its projectiles at varying heights. They are found on top of an ancient Chozo building on SR388, and frequently yield large energy units when destroyed.
The Blobs are blue in color and they each feature what appears to be a green eyeball, heavily implying they are living organisms themselves. They flutter in the air for several seconds before eventually disintegrating. It is unknown if the Blobs are part of the Blob Thrower's method of reproduction, or simply creatures that live in symbiosis with the flower and act as the latter's defenses.
To kill the Blob Thrower itself, Samus must fire from above at the orifice in the center of the flower. If she does not possess the High Jump Boots, it is preferable for Samus to wait for the Blob Thrower's stalk to contract, bringing the flower closer to the ground. Some timing is required, as the creature increases its height often and her weapon fire can hit the Blobs instead. Alternatively, if the Wave Beam is equipped, she can fire from various positions; the beam's helical trajectory massively increases the odds of hitting the Blob Thrower's weak point.
Blob Throwers return in Metroid: Samus Returns, a remake of Metroid II. They are present in Area 3 (and in later areas) and extend themselves up to the ceiling, blocking Samus's access. They can only be destroyed with the Beam Burst. They shoot out Seerook (or Pincher Fly) swarms when approached (rather than blobs).
The large, infected flowers present during the Nettori battle in Metroid Fusion greatly resemble Blob Throwers in regard to both their appearance and their ability to launch projectiles. However, they behave more similarly to Samus Eaters in the manner they trap their prey in their orifice, as well as their stalks being unable to extend at all.
"This plant creature spits out little blobs."
- It is unknown whether or not the Blob Thrower species became X Parasite hosts, as Samus did not encounter any Blob Thrower-X in Metroid Fusion.
- The X are known to combine the DNA of their previous hosts in order to produce unnatural organisms that possess abilities from different animals. The large flowers in Nettori's room, which feature traits from Blob Throwers and Samus Eaters, may therefore be the result of the X combining the genetic information of the latter two species.
- In one of the later areas of Samus Returns there is background art that has glowing fly-like things that partially resemble the 'blobs'.